fix(theme): improve theme color contrast for macOS Terminal.app (google-gemini#21175)

Author: clocky

packages/cli/src/ui/components/InputPrompt.test.tsx

@@ -2206,7 +2206,8 @@ describe('InputPrompt', () => {
         // Check that all lines, including the empty one, are rendered.
         // This implicitly tests that the Box wrapper provides height for the empty line.
         expect(frame).toContain('hello');
-        expect(frame).toContain(`world${chalk.inverse(' ')}`);
+        expect(frame).toContain('world');
+        expect(frame).toContain(chalk.inverse(' '));
 
         const outputLines = frame.trim().split('\n');
         // The number of lines should be 2 for the border plus 3 for the content.

packages/cli/src/ui/components/ThemeDialog.test.tsx

@@ -211,7 +211,7 @@ describe('Hint Visibility', () => {
       <ThemeDialog {...baseProps} settings={settings} />,
       {
         settings,
-        uiState: { terminalBackgroundColor: '#1E1E2E' },
+        uiState: { terminalBackgroundColor: '#000000' },
       },
     );
     await waitUntilReady();